| 摘要 |
PURPOSE: A manhole cover having a water pressure adjusting function is provided to enable the backward flow of sewage inside a manhole by increasing the lifting distance of an auxiliary cover. CONSTITUTION: A manhole cover(30) having a water pressure adjusting function is coupled to a manhole support(20). A recessed part having a latching protrusion(32) is formed on the center of the manhole cover. A support pipe(36) having a shaft hole is connected to the center of the recessed part through a support piece. An auxiliary cover(60) having a support shaft rod(62) is coupled to the recessed part. The support shaft rod is protruded through the shaft hole of the support pipe and is coupled to a spring(70) through a fastening nut(71). Multiple guide protrusions(64) are formed on the bottom surface of the auxiliary cover. |
